https://bugs.kde.org/show_bug.cgi?id=521990
Bug ID: 521990
Summary: Upgrading to Plasma 6.7.0 broke multi monitor support
Classification: Plasma
Product: kwin
Version First 6.7.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 193535
--> https://bugs.kde.org/attachment.cgi?id=193535&action=edit
Output from coredumpctl
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DESCRIPTION
I am running a Lenovo laptop with USB docking station with two external
monitors connected to the dock. This setup has been working flawless until I
upgraded to 6.7.
Now all 3 screens turn black the moment I plug in the docking station
connector. I’ll get a couple of "USB device connected" sounds until it will
eventually kill the session and show a basic logon screen.
A few times I also noticed that one of the screens was showing a dimmed out
desktop for a second or so until it went back to all black.
I did a partial downgrade to make sure it really was the Plasma update and not
any of the many other packages which got upgraded after a 2 weeks holiday
break, and yes, downgrading like below immediately made all screens work again.
sudo pacman -U /var/cache/pacman/pkg/kwin-6.6.5-3-x86_64.pkg.tar.zst \
/var/cache/pacman/pkg/plasma-workspace-6.6.5-2-x86_64.pkg.tar.zst \
/var/cache/pacman/pkg/libkscreen-6.6.5-1-x86_64.pkg.tar.zst \
/var/cache/pacman/pkg/kwayland-6.6.5-1-x86_64.pkg.tar.zst
System log shows core dumps which Dr Konqi picked up and automatically sent?
OBSERVED RESULT
Instead of turning on all 3 screens (Laptop + 2 connected to docking station)
turn black until eventuelly the laptop screen comes alive again with a basic
logon screen. Different than the normal login screen.
EXPECTED RESULT
All screens work like they did before the upgrade and after the partial
downgrade
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 7.0.12-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen AI 9 HX PRO 370 w/ Radeon 890M
Memory: 64 GiB of RAM (54,6 GiB usable)
Graphics Processor 1: AMD Radeon 890M Graphics
Graphics Processor 2: AMD Radeon 890M Graphics
Manufacturer: LENOVO
Product Name: 21RXCTO1WW
System Version: ThinkPad P16s Gen 4 AMD
ADDITIONAL INFORMATION
Docking station is a Lenovo ThinkPad Hybrid USB-C/A Dock (40AF0135EU)
Displays are connected via display port
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